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Finding the Fourth Proportional to 319.08, 478.76 and 156.95

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Solution

The fourth proportional to 319.08, 478.76 and 156.95 is: 235.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.08 : 478.76 = 156.95 : x
  2. Step 2: Convert to fraction form
    319.08/478.76 = 156.95/x
  3. Step 3: Cross multiply
    319.08x = 478.76 × 156.95
  4. Step 4: Simplify right side
    319.08x = 75,138.20
  5. Step 5: Solve for x
    x = 75,138.20/319.08
  6. Step 6: Final answer
    x = 235.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.